The best pricing can be found in the month of October. Prices to Idaho from Casper average $320. You can even find prices in October for less than $320, as users have found deals to Idaho from as low as $166. The month of December appears to be one of the more expensive times to travel to Idaho from Casper. Flying in the targeted month can save you up to 66%.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Casper to Idaho as you normally would.